Isaiah 35:7

7. And the parched ground This means the mirage, which shall really become a pool, or lake of water, as to the traveller over the desert it appears. From ten to twelve o’clock every sunshiny day the present writer witnessed, in the month of February, 1870, the phenomenon of the mirage in the desert et-Tih, between Sinai and Palestine. It seemed a pool or lake receding with each advancing step of the camels which our party were riding. Wherever it was not level, the hummocks and elevations seemed as islands. The figure of the sharab that is, the mirage is most true to nature.

Grass… reeds… rushes That is, all kinds of verdure suitable to such spots, shall exist where now all is blank desolation. Amid miracles like this, by which all nature shall be glorified, the people of Jehovah shall be redeemed.